Berkshire Hathaway HomeServices KoenigRubloff Realty Group, Impact Networking and Holiday Inn Chicago Mart Plaza River North took the top spots for large, midsize and small Chicagoland workplaces, respectively, according to rankings released by Energage on behalf of the Chicago Tribune. For the past decade, Energage has been ranking workplaces in the Chicago area and the nation through employee surveys, assessing everything from work-life balance to confidence in company leadership.